The House of Commons abruptly suspended its sitting before question period began Thursday.
Emergency vehicles were seen parked in front of Flaherty’s downtown Ottawa condo building.
Until he resigned from the cabinet last month, he had been the Harper government’s first and only finance minister.
He got the job in 2006 and held it through cabinet shuffles, economic turmoil and a bout with a rare skin disease that had him on steroids.
The condition, however, was not thought to be life-threatening.